RICHED20: EM_GETMODIFY should not report modification after WM_SETTEXT (fixes todo_wine)

[Alex Villací­s Lasso]

Trivial patch. This implements the requirement that WM_SETTEXT does not 
modify,
as examined by the EM_GETMODIFY message. Fixes one todo_wine.

Changelog:
* Unset modification flag after WM_SETTEXT.
* Removed todo_wine around test checking for not-modified after WM_SETTEXT.

-- 
perl -e '$x=2.4;print sprintf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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